var voorwarden ="-- U bent niet akkoord gegaan met de forumvoorwaarden.\n";
var login_err = "-- U bent vergeten uw login-naam in te vullen.\n"; 
var email_err ="-- U bent vergeten uw emailadres in te vullen.\n";
var pass_err = "-- U bent vergeten uw wachtwoord in te vullen.\n"; 
var herpass_err = "-- Uw wachtwoorden komen niet overeen.\n";
var subject_err = "-- U bent vergeten een onderwerp in te vullen.\n";
var body_err = "-- U bent vergeten een bericht te schrijven.\n";

function chkRegistration(f){
  var out = '';
  if(f.agree){
  if (!f.agree.checked){
		out += voorwarden;
	}
  }
	 if (f.Login.value.length <=0 ){
		out += login_err;
	}
	 if (f.Email.value.length <=0 ){
		out += email_err;
	}else{
	}
	
	 if (f.Userpass.value.length <=0){
		out += pass_err;
	  }else{
		  if(f.Userpass.value != f.herUserpass.value){
	  		out += herpass_err;
	
			}
	  }
  return finishChk(out);
}

function chkProfile(f){
  var out = '';
 	 if (f.Email.value.length <=0 ){
		out += email_err;
	}else{
	}
	if (f.Userpass.value.length >0){
	 if (f.Userpass.value.length <=0){
		out += pass_err;
	  }else{
		  if(f.Userpass.value != f.herUserpass.value){
	  		out += herpass_err;
	
			}
	  }
    }
   
  return finishChk(out);
}

function chkLogin(f){
 var out = "";
 if (f.Login.value.length <=0 ){
		out += login_err;
 }
 if (f.Userpass.value.length <=0){
		out += pass_err;
	  }
    return finishChk(out);
}
function chkTopicSubmit(f){
  var out=""
	if(f.Subject.value.length <=0){
	  out += subject_err;
	}
	if(f.Body.value.length <=0){
	  out += body_err;
	}
  return finishChk(out);
}

function chkMsgSubmit(f){
   var out=""
	if(f.Subject.value.length <=0){
	  out += subject_err;
	}
	if(f.Body.value.length <=0){
	  out += body_err;
	}
  return finishChk(out);
}
function chkPasswd(f){
var out="";
 if (f.Userpass.value.length <=0){
		out += pass_err;
	  }else{
		  if(f.password.value != f.herUserpass.value){
	  		out += herpass_err;
	
			}
	  }
  return finishChk(out);
}
function chkMailPass(f){
 var out="";
 	if(f.Email.value.length <=0){
	  out += email_err;
	}
 return finishChk(out);
}
function finishChk(out){
if(out.length > 0 ){
	  alert(out);
		return false;
	}else{
   return true;
	 }
}


 var popupHandle;
	
function openWindow(name, width, height, pagina){
 var properties = "width="+width+",height="+height+",toolbar=no,status=no,resizable=no,scrollbars=no";
	var leftprop, topprop, screenX, screenY, cursorX, cursorY, padAmt;
	if(navigator.appName == "Microsoft Internet Explorer") {
		screenY = document.body.offsetHeight;
		screenX = window.screen.availWidth;
	}else{
		screenY = window.outerHeight
		screenX = window.outerWidth
	}
	leftvar = Math.round((screenX - width) / 2);
	rightvar = Math.round((screenY - height) / 2);
	if(navigator.appName == "Microsoft Internet Explorer") {
		leftprop = leftvar;
		topprop = rightvar;
	}else {
		leftprop = (leftvar - pageXOffset);
		topprop = (rightvar - pageYOffset);
	}
	properties = properties + ",left=" + leftprop;
	properties = properties + ",top=" + topprop;
//
//
//  V O O R   O N D E R H O U D pagina's wisselen
//
	//var pagina="onderhoud.html";

//
//
	popupHandle = open( pagina, name, properties);
	setTimeout('popupHandle.focus();',250);

}